CN111650727B

CN111650727B - Optical imaging lens

Info

Publication number: CN111650727B
Application number: CN202010661440.7A
Authority: CN
Inventors: 张嘉元; 廖华滨; 刘新明
Original assignee: Genius Electronic Optical Xiamen Co Ltd
Current assignee: Genius Electronic Optical Xiamen Co Ltd
Priority date: 2020-07-10
Filing date: 2020-07-10
Publication date: 2022-04-08
Anticipated expiration: 2040-07-10
Also published as: TWI744996B; US20220011539A1; CN111650727A; TW202202890A; US11635583B2

Abstract

The invention discloses an optical imaging lens, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a fifth lens from an object side to an image side along an optical axis. A circumferential area of the image-side surface of the sixth lens element is convex. The optical imaging lens consists of the six lenses, the sum of five air gaps of the first lens to the sixth lens on the optical axis is larger than the sum of six thicknesses of the first lens to the sixth lens on the optical axis, the largest air gap is arranged between the second lens and the third lens, the object side surface and the image side surface of one of the second lens to the fifth lens are aspheric surfaces, and the following conditional expressions are satisfied: 2.000 ≦ EFL/ImgH, where EFL is defined as the effective focal length of the optical imaging lens and ImgH is defined as the image height of the optical imaging lens. The optical imaging lens has the advantages of increasing the effective focal length, maintaining the aperture value, maintaining the imaging quality, reducing the assembly difficulty and improving the manufacturing yield.

Description

Optical imaging lens

Technical Field

The invention relates to the field of optical imaging, in particular to an optical imaging lens.

Background

The specifications of portable electronic products are changing day by day, and one of the key components is: the optical imaging lens is also diversified and developed, the application of the optical imaging lens is not limited to image shooting and video recording, and the optical imaging lens can achieve the function of optical zooming by matching with the wide-angle lens in addition to the requirement of telescopic image shooting. The longer the effective focal length of the telephoto lens is, the higher the magnification of the optical zoom is.

When the effective focal length of the optical imaging lens is increased, the aperture value is increased, and the amount of light entering is also reduced. Therefore, it is one of the issues to be thoroughly discussed how to increase the effective focal length of the optical imaging lens, maintain the aperture value, maintain the imaging quality, reduce the assembly difficulty and increase the manufacturing yield.

Disclosure of Invention

Accordingly, to solve the above problems, embodiments of the present invention propose a six-piece optical imaging lens. The present invention provides a six-piece optical imaging lens, which is arranged with a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element in order from an object side to an image side. The first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element each have an object-side surface facing the object side and allowing the imaging light to pass therethrough, and an image-side surface facing the image side and allowing the imaging light to pass therethrough.

In an embodiment of the invention, a circumferential area of an image-side surface of the sixth lens element is a convex surface, wherein the optical imaging lens includes the above six lens elements, a total sum of five air gaps on an optical axis of the first lens element to the sixth lens element is greater than a total sum of six thicknesses on the optical axis of the first lens element to the sixth lens element, a maximum air gap is between the second lens element and the third lens element, an object-side surface and an image-side surface of one of the second lens element to the fifth lens element are aspheric surfaces, and the following conditional expressions are satisfied: 2.000 ≦ EFL/ImgH, where EFL is defined as the effective focal length of the optical imaging lens and ImgH is defined as the image height of the optical imaging lens.

In an embodiment of the invention, the first lens element has a positive refractive index, an optical axis region of the image-side surface of the sixth lens element is a convex surface, the optical imaging lens element includes the above six lens elements, a total sum of five air gaps on the optical axis of the first lens element to the sixth lens element is greater than a total sum of six thicknesses on the optical axis of the first lens element to the sixth lens element, a maximum air gap is located between the second lens element and the fourth lens element, an object-side surface and an image-side surface of one of the second lens element to the fifth lens element are aspheric, and the following conditional expressions are satisfied: 3.200 ≦ EFL/ImgH, where EFL is defined as the effective focal length of the optical imaging lens and ImgH is defined as the image height of the optical imaging lens.

In an embodiment of the invention, the second lens element has a negative refractive index, a circumferential area of an object-side surface of the fourth lens element is a concave surface, and a circumferential area of an image-side surface of the sixth lens element is a convex surface, wherein the optical imaging lens assembly includes the above six lens elements, a total sum of five air gaps on an optical axis of the first lens element to the sixth lens element is greater than a total sum of six thicknesses on the optical axis of the first lens element to the sixth lens element, a maximum air gap is between the first lens element and the fourth lens element, and an object-side surface and an image-side surface of one of the second lens element to the fifth lens element are aspheric, and the following conditional expressions are satisfied: 2.900 ≦ EFL/ImgH, where EFL is defined as the effective focal length of the optical imaging lens and ImgH is defined as the image height of the optical imaging lens.

In the optical imaging lens of the present invention, the embodiments may also selectively satisfy the following condition:

(1)0.800≦EFL/TTL；

(2)1.100≦EFL/TL；

(3)2.000≦EFL/ALT；

(4)L12t61/AAG≦1.600；

(5)L12t41/(T1+T6)≦3.000；

(6)L41t62/T1≦3.600；

(7)υ1+υ2+υ3+υ4+υ5+υ6≦255.000；

(8)υ2+υ3+υ4+υ5+υ6≦200.000；

(9)υ2+υ3+υ4+υ5≦170.000；

(10)L11t42/(G23+G34)≦2.000；

(11)L21t52/(G23+G45)≦2.500；

(12)L12t61/(G23+G56)≦2.700；

(13)(ALT24+G12+BFL)/Gmax≦2.220；

(14)(ALT35+G12+BFL)/Gmax≦2.620；

(15)(ALT46+G12+BFL)/Gmax≦2.320；

(16) (G12+ G34+ BFL)/T1 ≦ 5.320; and

(17)2*ImgH*Fno/EFL≦2.020。

wherein T1 is defined as the thickness of the first lens on the optical axis; t2 is defined as the thickness of the second lens on the optical axis; t3 is defined as the thickness of the third lens on the optical axis; t4 is defined as the thickness of the fourth lens on the optical axis; t5 is defined as the thickness of the fifth lens on the optical axis; t6 is defined as the thickness of the sixth lens on the optical axis; g12 is defined as an air gap on the optical axis between the first lens and the second lens; g23 is defined as an air gap on the optical axis between the second lens and the third lens; g34 is defined as an air gap on the optical axis between the third lens and the fourth lens; g45 is defined as an air gap on the optical axis between the fourth lens and the fifth lens; g56 is defined as an air gap on the optical axis between the fifth lens and the sixth lens; ALT is defined as the sum of the thicknesses of the six lenses on the optical axis from the first lens to the sixth lens; TL is defined as the distance from the object side surface of the first lens to the image side surface of the sixth lens on the optical axis; TTL is defined as the distance between the object side surface of the first lens and the imaging surface on the optical axis; BFL is defined as the distance from the image side surface of the sixth lens to the imaging surface on the optical axis; AAG is defined as the sum of five air gaps on the optical axis of the first lens to the sixth lens; EFL is defined as the effective focal length of the optical imaging lens; gmax is the largest air gap on the optical axis of the first lens to the sixth lens; fno is defined as the aperture value of the optical imaging lens.

In the present invention are further defined: ALT24 is the sum of the three thicknesses of the second to fourth lenses on the optical axis, i.e., the sum of T2, T3, and T4; ALT35 is the sum of three thicknesses of the third to fifth lenses on the optical axis, i.e., the sum of T3, T4, and T5; ALT46 is the sum of three thicknesses of the fourth to sixth lenses on the optical axis, i.e., the sum of T4, T5, and T6; l12t62 is the distance on the optical axis from the image-side surface of the first lens to the image-side surface of the sixth lens; l12t41 is the distance on the optical axis from the image-side surface of the first lens to the object-side surface of the fourth lens; l41t62 is the distance on the optical axis from the object-side surface of the fourth lens to the image-side surface of the sixth lens; l11t42 is the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the fourth lens; l21t52 is the distance on the optical axis from the object-side surface of the second lens to the image-side surface of the fifth lens; l12t61 is the distance on the optical axis from the image-side surface of the first lens to the object-side surface of the sixth lens.

The present invention is particularly directed to an optical imaging lens mainly used in an electronic photographing device for photographing images and recording images, such as an optical imaging lens applicable to a portable electronic device such as a mobile phone, a camera, a tablet computer, and a Personal Digital Assistant (PDA). The optical imaging lens has the advantages of increasing the effective focal length of the optical imaging lens, maintaining the aperture value, maintaining the imaging quality, reducing the assembly difficulty and improving the manufacturing yield.

Drawings

Fig. 1 to 5 are schematic diagrams illustrating a method for determining a curvature shape of an optical imaging lens according to the present invention.

FIG. 6 is a diagram of an optical imaging lens according to a first embodiment of the present invention.

Fig. 7 is a diagram illustrating longitudinal spherical aberration and various aberrations of the optical imaging lens according to the first embodiment.

FIG. 8 is a diagram of an optical imaging lens according to a second embodiment of the present invention.

Fig. 9 is a diagram illustrating longitudinal spherical aberration and various aberrations of the optical imaging lens according to the second embodiment.

FIG. 10 is a diagram of an optical imaging lens according to a third embodiment of the present invention.

Fig. 11 is a diagram illustrating longitudinal spherical aberration and various aberrations of the optical imaging lens according to the third embodiment.

FIG. 12 is a diagram of an optical imaging lens according to a fourth embodiment of the present invention.

Fig. 13 is a diagram illustrating longitudinal spherical aberration and various aberrations of the optical imaging lens according to the fourth embodiment.

Fig. 14 is a schematic diagram of a fifth embodiment of an optical imaging lens of the present invention.

Fig. 15 is a diagram illustrating longitudinal spherical aberration and various aberrations of the optical imaging lens according to the fifth embodiment.

Fig. 16 is a schematic diagram of an optical imaging lens according to a sixth embodiment of the present invention.

Fig. 17 is a diagram illustrating longitudinal spherical aberration and various aberrations of the optical imaging lens according to the sixth embodiment.

FIG. 18 is a diagram of an optical imaging lens according to a seventh embodiment of the present invention.

Fig. 19 is a diagram illustrating longitudinal spherical aberration and various aberrations of the optical imaging lens according to the seventh embodiment.

Fig. 20 shows a detailed optical data table diagram of the first embodiment.

Fig. 21 is a detailed aspherical data table diagram according to the first embodiment.

Fig. 22 shows a detailed optical data table diagram of the second embodiment.

Fig. 23 shows a detailed aspherical data table diagram of the second embodiment.

Fig. 24 shows a detailed optical data table diagram of the third embodiment.

Fig. 25 is a detailed aspherical data table diagram according to the third embodiment.

Fig. 26 shows a detailed optical data table diagram of the fourth embodiment.

Fig. 27 is a detailed aspherical data table diagram according to the fourth embodiment.

Fig. 28 shows a detailed optical data table diagram of the fifth embodiment.

Fig. 29 is a detailed aspherical data table diagram according to the fifth embodiment.

Fig. 30 shows a detailed optical data table diagram of the sixth embodiment.

Fig. 31 is a detailed aspherical data table diagram according to the sixth embodiment.

Fig. 32 shows a detailed optical data table diagram of the seventh embodiment.

Fig. 33 is a detailed aspherical data table diagram according to the seventh embodiment.

FIG. 34 is a table diagram showing the important parameters of each embodiment.

Detailed Description

Before beginning the detailed description of the invention, reference will first be made explicitly to the accompanying drawings in which: 1, an optical imaging lens; 11.21, 31, 41, 51, 61, 110, 410, 510 … item side; 12. 22, 32, 42, 52, 62, 120, 320 … image side; 13. 16, 23, 26, 33, 36, 43, 46, 53, 56, 63, 66, Z1 … optical axis regions; 14. 17, 24, 27, 34, 37, 44, 47, 54, 57, 64, 67, Z2 … circumferential regions; 10 … a first lens; 20 … second lens; 30 … third lens; 40 … fourth lens; 50 … fifth lens; 60 … sixth lens; 80 … aperture; 90 … optical filters; 91 … imaging plane

100. 200, 300, 400, 500 … lenses; 130 … assembly part; 211. 212 … parallel rays; a1 … object side; a2 … image side; CP … center point; CP1 … first center point; CP2 … second center point; TP1 … first transition point; TP2 … second transition point; OB … optical boundary; i … optical axis; lc … chief ray; lm … marginal rays; EL … extended line; z3 … relay zone; m, R … intersection point; the thickness of each lens of T1, T2, T3, T4, T5 and T6 … on the optical axis.

The terms "optic axis region", "circumferential region", "concave" and "convex" used in the present specification and claims should be interpreted based on the definitions set forth in the present specification.

The optical system of the present specification includes at least one lens that receives imaging light incident on the optical system within a half field of view (HFOV) angle from parallel to the optical axis. The imaging light is imaged on an imaging surface through the optical system. The term "a lens having positive refractive index (or negative refractive index)" means that the paraxial refractive index of the lens calculated by Gaussian optics theory is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of the imaging light rays passing through the lens surface. The imaging light includes at least two types of light: a chief ray (chief ray) Lc and a marginal ray (margin ray) Lm (shown in FIG. 1). The object-side (or image-side) surface of the lens may be divided into different regions at different positions, including an optical axis region, a circumferential region, or in some embodiments, one or more relay regions, the description of which will be described in detail below.

Fig. 1 is a radial cross-sectional view of a lens 100. Two reference points on the surface of the lens 100 are defined: a center point and a transition point. The center point of the lens surface is an intersection point of the surface and the optical axis I. As illustrated in fig. 1, the first center point CP1 is located on the object side 110 of the lens 100, and the second center point CP2 is located on the image side 120 of the lens 100. The transition point is a point on the lens surface, and a tangent to the point is perpendicular to the optical axis I. The optical boundary OB of a lens surface is defined as the point where the radially outermost marginal ray Lm passing through the lens surface intersects the lens surface. All transition points are located between the optical axis I and the optical boundary OB of the lens surface. In addition, if there are a plurality of transition points on a single lens surface, the transition points are sequentially named from the first transition point in the radially outward direction. For example, a first transition point TP1 (closest to the optical axis I), a second transition point TP2 (shown in fig. 4), and an nth transition point (farthest from the optical axis I).

A range from the center point to the first transition point TP1 is defined as an optical axis region, wherein the optical axis region includes the center point. The area radially outward of the nth switching point farthest from the optical axis I to the optical boundary OB is defined as a circumferential area. In some embodiments, a relay area between the optical axis area and the circumferential area may be further included, and the number of relay areas depends on the number of transition points.

When a light ray parallel to the optical axis I passes through a region, the region is convex if the light ray is deflected toward the optical axis I and the intersection point with the optical axis I is located on the lens image side a 2. When a light ray parallel to the optical axis I passes through a region, the region is concave if the intersection of the extension line of the light ray and the optical axis I is located on the object side a1 of the lens.

In addition, referring to FIG. 1, the lens 100 may further include an assembling portion 130 extending radially outward from the optical boundary OB. The assembling portion 130 is generally used for assembling the lens 100 to a corresponding element (not shown) of an optical system. The imaging light does not reach the assembling portion 130. The structure and shape of the assembly portion 130 are merely examples for illustrating the present invention, and the scope of the present invention is not limited thereby. The lens assembling portion 130 discussed below may be partially or entirely omitted from the drawings.

Referring to fig. 2, an optical axis region Z1 is defined between the center point CP and the first transition point TP 1. A circumferential zone Z2 is defined between the first transition point TP1 and the optical boundary OB of the lens surface. As shown in fig. 2, the parallel light ray 211 after passing through the optical axis region Z1 intersects the optical axis I at the image side a2 of the lens 200, i.e., the focal point of the parallel light ray 211 passing through the optical axis region Z1 is located at the R point of the image side a2 of the lens 200. Since the light ray intersects the optical axis I at the image side a2 of the lens 200, the optical axis region Z1 is convex. In contrast, the parallel rays 212 diverge after passing through the circumferential zone Z2. As shown in fig. 2, an extension line EL of the parallel light ray 212 passing through the circumferential region Z2 intersects the optical axis I at the object side a1 of the lens 200, i.e., a focal point of the parallel light ray 212 passing through the circumferential region Z2 is located at a point M on the object side a1 of the lens 200. Since the extension line EL of the light ray intersects the optical axis I at the object side a1 of the lens 200, the circumferential region Z2 is concave. In the lens 200 shown in fig. 2, the first transition point TP1 is a boundary between the optical axis region and the circumferential region, i.e., the first transition point TP1 is a boundary point between convex and concave surfaces.

On the other hand, the determination of the surface shape irregularity of the optical axis region may be performed by the determination method of a person ordinarily skilled in the art, i.e., by determining the sign of the paraxial radius of curvature (abbreviated as R value) of the optical axis region surface shape irregularity of the lens. The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens data sheets) of optical design software. When the R value is positive, the optical axis area of the object side is judged to be a convex surface; and when the R value is negative, judging that the optical axis area of the object side surface is a concave surface. On the contrary, when the R value is positive, the optical axis area of the image side surface is judged to be a concave surface; when the R value is negative, the optical axis area of the image side surface is judged to be convex. The determination result of the method is consistent with the determination result of the intersection point between the ray/ray extension line and the optical axis, i.e. the determination method of the intersection point between the ray/ray extension line and the optical axis is to determine the surface-shaped convexo-concave by locating the focus of the ray parallel to the optical axis at the object side or the image side of the lens. Alternatively, as described herein, a region that is convex (or concave), or a region that is convex (or concave) may be used.

Fig. 3 to 5 provide examples of determining the surface shape and the zone boundary of the lens zone in each case, including the optical axis zone, the circumferential zone, and the relay zone described above.

Fig. 3 is a radial cross-sectional view of lens 300. Referring to fig. 3, the image side 320 of the lens 300 presents only one transition point TP1 within the optical boundary OB. Fig. 3 shows an optical axis region Z1 and a circumferential region Z2 on the image side surface 320 of the lens 300. The R value of the image side surface 320 is positive (i.e., R >0), and thus the optical axis region Z1 is concave.

Generally, the shape of each region bounded by the transition point is opposite to the shape of the adjacent region, and thus the transition point can be used to define the transition of the shapes from concave to convex or from convex to concave. In fig. 3, the optical axis region Z1 is concave, and the surface transitions at the transition point TP1, so the circumferential region Z2 is convex.

Fig. 4 is a radial cross-sectional view of lens 400. Referring to fig. 4, the object side surface 410 of the lens 400 has a first transition point TP1 and a second transition point TP 2. An optical axis region Z1 of the object side surface 410 between the optical axis I and the first transition point TP1 is defined. The object side surface 410 has a positive value of R (i.e., R >0), and thus the optical axis region Z1 is convex.

A circumferential region Z2 is defined between the second transition point TP2 and the optical boundary OB of the object-side face 410 of the lens 400, the circumferential region Z2 of the object-side face 410 also being convex. In addition, a relay zone Z3 is defined between the first transition point TP1 and the second transition point TP2, and the relay zone Z3 of the object side 410 is concave. Referring again to fig. 4, the object side surface 410 includes, in order radially outward from the optical axis I, an optical axis region Z1 between the optical axis I and the first transition point TP1, a relay region Z3 between the first transition point TP1 and the second transition point TP2, and a circumferential region Z2 between the second transition point TP2 and the optical boundary OB of the object side surface 410 of the lens 400. Since the optical axis region Z1 is convex, the surface shape changes from the first transition point TP1 to concave, the relay region Z3 is concave, and the surface shape changes from the second transition point TP2 to convex, so the circumferential region Z2 is convex.

Fig. 5 is a radial cross-sectional view of lens 500. The object side 510 of the lens 500 has no transition point. For a lens surface without a transition point, such as the object side 510 of the lens 500, an optical axis area is defined as 0-50% of the distance from the optical axis I to the optical boundary OB of the lens surface, and a circumferential area is defined as 50-100% of the distance from the optical axis I to the optical boundary OB of the lens surface. Referring to the lens 500 shown in fig. 5, 50% of the distance from the optical axis I to the optical boundary OB on the surface of the lens 500 from the optical axis I is defined as an optical axis region Z1 of the object side surface 510. The object side surface 510 has a positive value of R (i.e., R >0), and thus the optical axis region Z1 is convex. Since the object-side surface 510 of the lens 500 has no transition point, the circumferential region Z2 of the object-side surface 510 is also convex. The lens 500 may further have an assembling portion (not shown) extending radially outward from the circumferential region Z2.

As shown in fig. 6, the optical imaging lens assembly 1 of the present invention mainly comprises six lens elements along an optical axis I from an object side a1 where an object (not shown) is placed to an image side a2 where an image is formed, and sequentially includes an aperture stop 80, a first lens element 10, a second lens element 20, a third lens element 30, a fourth lens element 40, a fifth lens element 50, a sixth lens element 60, and an image plane 91. Generally, the first lens element 10, the second lens element 20, the third lens element 30, the fourth lens element 40, the fifth lens element 50 and the sixth lens element 60 can be made of a transparent plastic material, but the invention is not limited thereto. Each lens has an appropriate refractive index. In the optical imaging lens assembly 1 of the present invention, the total number of the lens elements with refractive index is only six lens elements, namely, the first lens element 10, the second lens element 20, the third lens element 30, the fourth lens element 40, the fifth lens element 50 and the sixth lens element 60. The optical axis I is the optical axis of the entire optical imaging lens 1, so the optical axis of each lens and the optical axis of the optical imaging lens 1 are the same.

In addition, the optical imaging lens 1 further includes an aperture stop (aperture stop)80 provided at an appropriate position. In fig. 6, the diaphragm 80 is disposed between the first lens 10 and the object side a 1. When light (not shown) emitted from an object (not shown) located on the object side a1 enters the optical imaging lens system 1 of the present invention, the light sequentially passes through the stop 80, the first lens element 10, the second lens element 20, the third lens element 30, the fourth lens element 40, the fifth lens element 50, the sixth lens element 60 and the filter 90, and is focused on the image plane 91 of the image side a2 to form a sharp image. In the embodiments of the present invention, the filter 90 is disposed between the sixth lens element 60 and the image plane 91, and may be a filter with various suitable functions, such as an infrared cut-off filter (infrared cut-off filter), which is used to prevent infrared rays in the imaging light from being transmitted to the image plane 91 to affect the imaging quality.

Each lens element of the optical imaging lens 1 of the present invention has an object-side surface facing the object side a1 and passing the imaging light, and an image-side surface facing the image side a2 and passing the imaging light. In addition, each lens in the optical imaging lens 1 of the present invention also has an optical axis region and a circumference region. For example, the first lens 10 has an object side 11 and an image side 12; the second lens 20 has an object-side surface 21 and an image-side surface 22; the third lens element 30 has an object-side surface 31 and an image-side surface 32; the fourth lens 40 has an object-side surface 41 and an image-side surface 42; the fifth lens element 50 has an object-side surface 51 and an image-side surface 52; the sixth lens element 60 has an object-side surface 61 and an image-side surface 62. The object side surface and the image side surface respectively have an optical axis area and a circumference area.

Each lens in the optical imaging lens 1 of the present invention further has a thickness T on the optical axis I. For example, the first lens 10 has a first lens thickness T1, the second lens 20 has a second lens thickness T2, the third lens 30 has a third lens thickness T3, the fourth lens 40 has a fourth lens thickness T4, the fifth lens 50 has a fifth lens thickness T5, and the sixth lens 60 has a sixth lens thickness T6. Therefore, the total thickness of the six lenses of the first lens 10 to the sixth lens 60 on the optical axis I in the optical imaging lens 1 of the present invention is referred to as ALT. That is, ALT ═ T1+ T2+ T3+ T4+ T5+ T6.

In addition, in the optical imaging lens 1 of the present invention, there is an air gap (air gap) between the respective lenses on the optical axis I. For example, the air gap between the first lens 10 and the second lens 20 is referred to as G12, the air gap between the second lens 20 and the third lens 30 is referred to as G23, the air gap between the third lens 30 and the fourth lens 40 is referred to as G34, the air gap between the fourth lens 40 and the fifth lens 50 is referred to as G45, and the air gap between the fifth lens 50 and the sixth lens 60 is referred to as G56. Therefore, the sum of five air gaps located on the optical axis I from the first lens 10 to the sixth lens 60 is referred to as AAG. That is, AAG is G12+ G23+ G34+ G45+ G56.

In addition, the distance from the object-side surface 11 of the first lens element 10 to the imaging surface 91 on the optical axis I is the system length TTL of the optical imaging lens system 1. The effective focal length of the optical imaging lens 1 is EFL, and the distance between the object-side surface 11 of the first lens element 10 and the image-side surface 62 of the sixth lens element 60 on the optical axis I is TL. The HFOV is a half View angle of the optical imaging lens 1, i.e., a half of a maximum View angle (Field of View), the ImgH is an image height of the optical imaging lens 1, and the Fno is an aperture value of the optical imaging lens 1.

When the filter 90 is arranged between the sixth lens 60 and the imaging plane 91, G6F represents an air gap on the optical axis I from the sixth lens 60 to the filter 90, TF represents a thickness on the optical axis I of the filter 90, GFP represents an air gap on the optical axis I from the filter 90 to the imaging plane 91, and BFL is a back focal length of the optical imaging lens 1, that is, a distance on the optical axis I from the image side surface 62 of the sixth lens 60 to the imaging plane 91, that is, BFL is G6F + TF + GFP.

In addition, redefining: f1 is the focal length of the first lens 10; f2 is the focal length of the second lens 20; f3 is the focal length of the third lens 30; f4 is the focal length of the fourth lens 40; f5 is the focal length of the fifth lens 50; f6 is the focal length of the sixth lens 60; n1 is the refractive index of the first lens 10; n2 is the refractive index of the second lens 20; n3 is the refractive index of the third lens 30; n4 is the refractive index of the fourth lens 40; n5 is the refractive index of the fifth lens 50; n6 is the refractive index of the sixth lens 60; upsilon 1 is an abbe coefficient of the first lens 10; ν 2 is an abbe coefficient of the second lens 20; ν 3 is an abbe coefficient of the third lens 30; ν 4 is an abbe coefficient of the fourth lens 40; ν 5 is an abbe coefficient of the fifth lens 50; ν 6 is an abbe number of the sixth lens 60.

In the present invention are further defined: gmax is the largest air gap on the optical axis of the first to sixth lenses, i.e., the maximum of G12, G23, G34, G45, G56; the ALT24 is the sum of three thicknesses of the second lens 20 to the fourth lens 40 on the optical axis I, i.e., the sum of T2, T3, and T4; the ALT35 is the sum of three thicknesses of the third lens 30 to the fifth lens 50 on the optical axis I, i.e., the sum of T3, T4, and T5; the ALT46 is the sum of three thicknesses of the fourth lens 40 to the sixth lens 60 on the optical axis I, i.e., the sum of T4, T5, and T6; l12t62 is the distance on the optical axis I from the image-side surface 12 of the first lens 10 to the image-side surface 62 of the sixth lens 60; l12t41 is the distance on the optical axis I from the image-side surface 12 of the first lens element 10 to the object-side surface 41 of the fourth lens element 40; l41t62 is the distance on the optical axis I from the object-side surface 41 of the fourth lens element 40 to the image-side surface 62 of the sixth lens element 60; l11t42 is the distance on the optical axis I from the object-side surface 11 of the first lens element 10 to the image-side surface 42 of the fourth lens element 40; l21t52 is the distance on the optical axis I from the object-side surface 21 of the second lens 20 to the image-side surface 52 of the fifth lens 50; l12t61 is the distance on the optical axis I from the image-side surface 12 of the first lens element 10 to the object-side surface 61 of the sixth lens element 60; CT is the thickness of any lens on the optical axis I, namely the thickness of the center of the lens; ET is the distance in the direction of the optical axis I from the optical boundary of the object side surface to the optical boundary of the image side surface of any lens, i.e. the thickness of the lens circumference.

First embodiment

Referring to fig. 6, a first embodiment of the optical imaging lens 1 of the present invention is illustrated. The longitudinal spherical aberration (longitudinal spherical aberration) on the imaging plane 91 in the first embodiment is shown in fig. 7 a, the field curvature (field) aberration in the sagittal direction is shown in fig. 7B, the field curvature aberration in the tangential direction is shown in fig. 7C, and the distortion aberration is shown in fig. 7D. The Y-axis of each spherical aberration diagram in all the embodiments represents the field of view, the highest point thereof is 1.0, the Y-axis of each aberration diagram and distortion aberration diagram in the embodiments represents the Image Height, and the system Image Height (ImgH) of the first embodiment is 2.580 mm.

The optical imaging lens 1 of the first embodiment is mainly composed of six lenses with refractive indexes, a diaphragm 80, and an image plane 91. The diaphragm 80 of the first embodiment is disposed between the first lens 10 and the object side a 1.

The first lens element 10 has a positive refractive index. An optical axis region 13 of the object-side surface 11 of the first lens element 10 is convex and a peripheral region 14 thereof is convex, and an optical axis region 16 of the image-side surface 12 of the first lens element 10 is convex and a peripheral region 17 thereof is convex. The object-side surface 11 and the image-side surface 12 of the first lens element 10 are aspheric, but not limited thereto.

The second lens element 20 has a negative refractive index. The optical axis region 23 of the object-side surface 21 of the second lens element 20 is concave and the peripheral region 24 thereof is concave, and the optical axis region 26 of the image-side surface 22 of the second lens element 20 is convex and the peripheral region 27 thereof is convex. The object-side surface 21 and the image-side surface 22 of the second lens element 20 are aspheric, but not limited thereto.

The third lens element 30 has a positive refractive index, an optical axis region 33 of the object-side surface 31 of the third lens element 30 is concave, a peripheral region 34 of the optical axis region is concave, and an optical axis region 36 of the image-side surface 32 of the third lens element 30 is convex, and a peripheral region 37 of the optical axis region is convex. The object-side surface 31 and the image-side surface 32 of the third lens element 30 are aspheric, but not limited thereto.

The fourth lens element 40 has a positive refractive index, an optical axis region 43 of the object-side surface 41 of the fourth lens element 40 is concave, a peripheral region 44 of the optical axis region is concave, and an optical axis region 46 of the image-side surface 42 of the fourth lens element 40 is convex, and a peripheral region 47 of the optical axis region is convex. The object-side surface 41 and the image-side surface 42 of the fourth lens element 40 are aspheric, but not limited thereto.

The fifth lens element 50 has a positive refractive index, an optical axis region 53 of the object-side surface 51 of the fifth lens element 50 is concave, a peripheral region 54 thereof is concave, an optical axis region 56 of the image-side surface 52 of the fifth lens element 50 is convex, and a peripheral region 57 thereof is convex. The object-side surface 51 and the image-side surface 52 of the fifth lens element 50 are aspheric, but not limited thereto.

The sixth lens element 60 has a positive refractive index, an optical axis region 63 of an object-side surface 61 of the sixth lens element 60 is concave, a peripheral region 64 thereof is convex, an optical axis region 66 of an image-side surface 62 of the sixth lens element 60 is convex, and a peripheral region 67 thereof is convex. The object-side surface 61 and the image-side surface 62 of the sixth lens element 60 are aspheric, but not limited thereto.

In the optical imaging lens assembly 1 of the present invention, twelve curved surfaces of all of the object-side surface 11/21/31/41/51/61 and the image-side surface 12/22/32/42/52/62 are aspheric, but not limited thereto, from the first lens element 10 to the sixth lens element 60. If the aspheric surfaces are aspheric surfaces, the aspheric surfaces are defined by the following formulas:

wherein:

y represents the vertical distance between a point on the aspheric curved surface and the optical axis I;

z represents the depth of the aspheric surface (the perpendicular distance between a point on the aspheric surface that is Y from the optical axis I and a tangent plane tangent to the vertex on the optical axis I);

r represents the radius of curvature of the lens surface at the paraxial region I;

k is cone constant;

a_2iare aspheric coefficients of order 2 i.

Optical data of the optical imaging lens system of the first embodiment is shown in fig. 20, and aspherical data is shown in fig. 21. In the optical imaging lens system of the following embodiments, an aperture value (f-number) of the integral optical imaging lens is Fno, an Effective Focal Length (EFL), and a Half Field of View (HFOV) is Half of a maximum Field of View (Field of View) of the integral optical imaging lens, wherein the height, radius of curvature, thickness, and focal length of the optical imaging lens are all in millimeters (mm). In the present embodiment, EFL is 7.482 mm; HFOV 15.845 degrees; TTL 7.288 mm; fno 2.840; ImgH 2.580 mm.

Second embodiment

Referring to fig. 8, a second embodiment of the optical imaging lens 1 of the present invention is illustrated. Please note that, from the second embodiment, to simplify and clearly express the drawings, only the optical axis area and the circumferential area of each lens with different surface shapes from those of the first embodiment are specifically marked on the drawings, and the optical axis area and the circumferential area of the remaining lens with the same surface shape as that of the lens of the first embodiment, such as the concave surface or the convex surface, are not separately marked. In the second embodiment, please refer to a in fig. 9 for longitudinal spherical aberration on the image plane 91, B in fig. 9 for field curvature aberration in sagittal direction, C in fig. 9 for field curvature aberration in meridional direction, and D in fig. 9 for distortion aberration. The second embodiment is similar to the first embodiment except that the parameters of the second embodiment are different, such as the refractive index, the radius of curvature, the thickness, the aspheric surface coefficient or the back focal length. In addition, in the present embodiment, the circumferential region 24 of the object-side surface 21 of the second lens element 20 is convex, the optical axis region 26 of the image-side surface 22 of the second lens element 20 is concave and the circumferential region 27 thereof is concave, the optical axis region 43 of the object-side surface 41 of the fourth lens element 40 is convex, the fifth lens element 50 has negative refractive power, the optical axis region 56 of the image-side surface 52 of the fifth lens element 50 is concave, the optical axis region 63 of the object-side surface 61 of the sixth lens element 60 is convex and the circumferential region 64 thereof is concave.

Detailed optical data of the second embodiment is shown in fig. 22, and aspherical data is shown in fig. 23. In the present embodiment, EFL is 5.812 mm; HFOV 24.754 degrees; TTL 6.190 mm; fno 2.325; ImgH 2.520 mm. In particular: 1. the aperture value of the present embodiment is smaller than that of the first embodiment; 2. the longitudinal spherical aberration of the present embodiment is smaller than that of the first embodiment; 3. the field curvature aberration in the sagittal direction of the present embodiment is smaller than the field curvature aberration in the sagittal direction of the first embodiment; 4. the field curvature aberration in the meridional direction of the present embodiment is smaller than the field curvature aberration in the noon direction of the first embodiment; 5. the distortion aberration of the present embodiment is smaller than that of the first embodiment.

Third embodiment

Referring to fig. 10, a third embodiment of the optical imaging lens 1 of the present invention is illustrated. In the third embodiment, please refer to a in fig. 11 for longitudinal spherical aberration on the image plane 91, B in fig. 11 for sagittal curvature aberration, C in fig. 11 for meridional curvature aberration, and D in fig. 11 for distortion aberration. The third embodiment is similar to the first embodiment except that the parameters of the third embodiment are different, such as the refractive index, the radius of curvature, the thickness, the aspheric surface coefficient or the back focal length. In addition, in the present embodiment, the circumferential region 24 of the object-side surface 21 of the second lens element 20 is convex, the optical axis region 26 of the image-side surface 22 of the second lens element 20 is concave and the circumferential region 27 thereof is concave, the third lens element 30 has negative refractive index, the fourth lens element 40 has negative refractive index, the optical axis region 46 of the image-side surface 42 of the fourth lens element 40 is concave, the fifth lens element 50 has negative refractive index, the optical axis region 53 of the object-side surface 51 of the fifth lens element 50 is convex, the optical axis region 56 of the image-side surface 52 of the fifth lens element 50 is concave, the optical axis region 63 of the object-side surface 61 of the sixth lens element 60 is convex and the circumferential region 64 thereof is concave.

The detailed optical data of the third embodiment is shown in fig. 24, the aspheric data is shown in fig. 25, and in this embodiment, EFL is 8.064 mm; HFOV 13.292 degrees; TTL 10.080 mm; fno 2.800; ImgH 2.520 mm. In particular: 1. the aperture value of the present embodiment is smaller than that of the first embodiment; 2. the longitudinal spherical aberration of the present embodiment is smaller than that of the first embodiment; 3. the field curvature aberration in the sagittal direction of the present embodiment is smaller than the field curvature aberration in the sagittal direction of the first embodiment; 4. the field curvature aberration in the meridional direction of the present embodiment is smaller than the field curvature aberration in the noon direction of the first embodiment; 5. the distortion aberration of the present embodiment is smaller than that of the first embodiment; 6. the effective focal length of this embodiment is larger than that of the first embodiment.

Fourth embodiment

Referring to fig. 12, a fourth embodiment of the optical imaging lens 1 of the present invention is illustrated. In the fourth embodiment, please refer to a in fig. 13 for longitudinal spherical aberration on the image plane 91, B in fig. 13 for field curvature aberration in sagittal direction, C in fig. 13 for field curvature aberration in meridional direction, and D in fig. 13 for distortion aberration. The fourth embodiment is similar to the first embodiment except that the parameters of the fourth embodiment are different, such as the refractive index, the radius of curvature, the thickness, the aspheric surface coefficient or the back focal length. In addition, in the present embodiment, the optical axis region 26 of the image-side surface 22 of the second lens element 20 is concave, the third lens element 30 has negative refractive power, the fifth lens element 50 has negative refractive power, the optical axis region 53 of the object-side surface 51 of the fifth lens element 50 is convex, and the optical axis region 56 of the image-side surface 52 of the fifth lens element 50 is concave.

Detailed optical data of the fourth embodiment is shown in fig. 26, and aspherical data is shown in fig. 27. In the present embodiment, EFL is 11.211 mm; HFOV 12.949 degrees; TTL 9.692 mm; fno 3.503; ImgH 2.520 mm. In particular: 1. the longitudinal spherical aberration of the present embodiment is smaller than that of the first embodiment; 2. the distortion aberration of the present embodiment is smaller than that of the first embodiment; 3. the effective focal length of this embodiment is larger than that of the first embodiment.

Fifth embodiment

Referring to fig. 14, a fifth embodiment of the optical imaging lens 1 of the present invention is illustrated. In the fifth embodiment, please refer to a in fig. 15 for longitudinal spherical aberration on the image plane 91, B in fig. 15 for field curvature aberration in sagittal direction, C in fig. 15 for field curvature aberration in meridional direction, and D in fig. 15 for distortion aberration. The fifth embodiment is similar to the first embodiment except that the parameters of the fifth embodiment are different, such as the refractive index, the radius of curvature, the thickness, the aspheric surface coefficient, and the back focal length. In addition, in the present embodiment, the optical axis region 23 of the object-side surface 21 of the second lens element 20 is convex and the circumferential region 24 thereof is convex, the optical axis region 26 of the image-side surface 22 of the second lens element 20 is concave and the circumferential region 27 thereof is concave, the third lens element 30 has negative refractive index, the fourth lens element 40 has negative refractive index, the optical axis region 46 of the image-side surface 42 of the fourth lens element 40 is concave, the fifth lens element 50 has negative refractive index, the optical axis region 53 of the object-side surface 51 of the fifth lens element 50 is convex, the optical axis region 56 of the image-side surface 52 of the fifth lens element 50 is concave, and the sixth lens element 60 has negative refractive index.

The detailed optical data of the fifth embodiment is shown in fig. 28, the aspheric data is shown in fig. 29, and in this embodiment, EFL is 17.755 mm; HFOV 12.269 degrees; TTL 10.738 mm; fno 5.548; ImgH 2.536 mm. In particular: 1. the effective focal length of this embodiment is larger than that of the first embodiment.

Sixth embodiment

Referring to fig. 16, a sixth embodiment of the optical imaging lens 1 of the present invention is illustrated. In the sixth embodiment, please refer to a in fig. 17 for longitudinal spherical aberration on the image plane 91, B in fig. 17 for sagittal curvature aberration, C in fig. 17 for meridional curvature aberration, and D in fig. 17 for distortion aberration. The design of the sixth embodiment is similar to that of the first embodiment, except that the parameters of the lens refractive index, the radius of curvature of the lens, the thickness of the lens, the aspheric coefficients of the lens, or the back focal length are different. In addition, in the present embodiment, the optical axis region 23 of the object-side surface 21 of the second lens element 20 is convex and the peripheral region 24 thereof is convex, the optical axis region 26 of the image-side surface 22 of the second lens element 20 is concave and the peripheral region 27 thereof is concave, the third lens element 30 has negative refractive index, the optical axis region 36 of the image-side surface 32 of the third lens element 30 is concave and the peripheral region 37 thereof is concave, the optical axis region 43 of the object-side surface 41 of the fourth lens element 40 is convex, the optical axis region 46 of the image-side surface 42 of the fourth lens element 40 is concave, the fifth lens element 50 has negative refractive index, the optical axis region 53 of the object-side surface 51 of the fifth lens element 50 is convex, the optical axis region 56 of the image-side surface 52 of the fifth lens element 50 is concave, and the peripheral region 64 of the object-side surface 61 of the sixth lens element 60 is concave.

The detailed optical data of the sixth embodiment is shown in fig. 30, the aspheric data is shown in fig. 31, and in this embodiment, EFL is 9.008 mm; HFOV 15.881 degrees; TTL 8.263 mm; fno 2.800; ImgH 2.520 mm. In particular: 1. the aperture value of the present embodiment is smaller than that of the first embodiment; 2. the longitudinal spherical aberration of the present embodiment is smaller than that of the first embodiment; 3. the field curvature aberration in the sagittal direction of the present embodiment is smaller than the field curvature aberration in the sagittal direction of the first embodiment; 4. the field curvature aberration in the meridional direction of the present embodiment is smaller than the field curvature aberration in the noon direction of the first embodiment; 5. the distortion aberration of the present embodiment is smaller than that of the first embodiment; 6. the effective focal length of this embodiment is larger than that of the first embodiment.

Seventh embodiment

Referring to fig. 18, a seventh embodiment of the optical imaging lens 1 of the present invention is illustrated. In the seventh embodiment, please refer to a in fig. 19 for longitudinal spherical aberration on the image plane 91, B in fig. 19 for sagittal curvature aberration, C in fig. 19 for meridional curvature aberration, and D in fig. 19 for distortion aberration. The design of the seventh embodiment is similar to that of the first embodiment, except that the parameters of the lens refractive index, the radius of curvature of the lens, the thickness of the lens, the aspheric coefficients of the lens, or the back focal length are different. In addition, in the present embodiment, the circumferential region 24 of the object-side surface 21 of the second lens element 20 is convex, the optical axis region 26 of the image-side surface 22 of the second lens element 20 is concave and the circumferential region 27 thereof is concave, the third lens element 30 has negative refractive index, the optical axis region 33 of the object-side surface 31 of the third lens element 30 is convex and the circumferential region 34 thereof is convex, the optical axis region 36 of the image-side surface 32 of the third lens element 30 is concave and the circumferential region 37 thereof is concave, the optical axis region 43 of the object-side surface 41 of the fourth lens element 40 is convex, the optical axis region 46 of the image-side surface 42 of the fourth lens element 40 is concave, the fifth lens element 50 has negative refractive index, the optical axis region 53 of the object-side surface 51 of the fifth lens element 50 is convex, the optical axis region 56 of the image-side surface 52 of the fifth lens element 50 is concave, and the optical axis region 63 of the object-side surface 61 of the sixth lens element 60 is convex.

The detailed optical data of the seventh embodiment is shown in fig. 32, the aspheric data is shown in fig. 33, and in this embodiment, EFL is 8.464 mm; HFOV 16.160 degrees; TTL 7.729 mm; fno 2.800; ImgH 2.520 mm. In particular: 1. the aperture value of the present embodiment is smaller than that of the first embodiment; 2. the longitudinal spherical aberration of the present embodiment is smaller than that of the first embodiment; 3. the field curvature aberration in the sagittal direction of the present embodiment is smaller than the field curvature aberration in the sagittal direction of the first embodiment; 4. the field curvature aberration in the meridional direction of the present embodiment is smaller than the field curvature aberration in the noon direction of the first embodiment; 5. the distortion aberration of the present embodiment is smaller than that of the first embodiment; 6. the effective focal length of this embodiment is larger than that of the first embodiment.

In addition, the important parameters of each embodiment are summarized in FIG. 34.

The embodiments of the invention provide an optical imaging lens with good imaging quality. For example, the concave-convex design satisfying the following lens surface shapes can effectively reduce the curvature of field and the distortion rate, and has the characteristics of optimizing the imaging quality of the optical imaging lens system and the corresponding effects that can be achieved:

1. when the following conditions are met, the sum of five air gaps of the first lens to the sixth lens on the optical axis is larger than the sum of six thicknesses of the first lens to the sixth lens on the optical axis, and the object side surface and the image side surface of one of the second lens to the fifth lens are aspheric, and the following conditions are matched, so that the difference between the central thickness and the circumferential thickness of one of the second lens to the fifth lens is favorably reduced, the ejection forming yield is improved, and the system focal length of the optical imaging lens is increased and the aperture value is maintained; the difference between the central thickness and the circumferential thickness of one of the second lens and the fifth lens can be determined by the condition of 0.300 ≦ CT/ET ≦ 2.000, wherein the preferred range is 0.400 ≦ CT/ET ≦ 1.600:

(1) the peripheral area of the image-side surface of the sixth lens is convex, the maximum air gap is between the second lens and the third lens and satisfies the condition of 2.000 ≦ EFL/ImgH, preferably 2.000 ≦ EFL/ImgH ≦ 10.000.

(2) The first lens element has a positive refractive index, an optical axis area of an image side surface of the sixth lens element is a convex surface, and a maximum air gap is between the second lens element and the fourth lens element and satisfies an EFL/ImgH condition of 3.200 ≦ EFL/ImgH of 10.000.

(3) The second lens element has a negative refractive index, the peripheral area of the object side surface of the fourth lens element is concave, the peripheral area of the image side surface of the sixth lens element is convex, and the maximum air gap between the first lens element and the fourth lens element satisfies the condition that 2.900 ≦ EFL/ImgH, preferably 2.900 ≦ EFL/ImgH ≦ 10.000.

2. The optical imaging lens further meets the condition that upsilon 1+ upsilon 2+ upsilon 3+ upsilon 4+ upsilon 5+ upsilon 6 is less than or equal to 255.000, upsilon 2+ upsilon 3+ upsilon 4+ upsilon 5+ upsilon 6 is less than or equal to 200.000 or upsilon 2+ upsilon 3+ upsilon 4+ upsilon 5 is less than or equal to 170.000, so that the effective focal length of the optical imaging lens is increased, and chromatic aberration is corrected. Preferred ranges are 150.000 ≦ υ 1+ υ 2+ υ 3+ υ 4+ υ 5+ υ 6 ≦ 255.000, 90.000 ≦ υ 2+ υ 3+ υ 4+ υ 5+ υ 6 ≦ 200.000 or 70.000 ≦ υ 2+ υ 3+ υ 4+ υ 5 ≦ 170.000.

3. The optical imaging lens further satisfies the following conditional expressions, which is helpful to maintain an appropriate value for each of the effective focal length and optical parameters, and avoid that any parameter is too large to be beneficial to the correction of the aberration of the optical imaging system as a whole, or that any parameter is too small to be beneficial to the assembly or increase the difficulty in manufacturing:

(1) EFL/TTL is more than or equal to 0.800 and more preferably is more than or equal to 0.800 and less than or equal to 1.700;

(2)1.100 ≦ EFL/TL ≦ 1.800, preferably in the range 1.100 ≦ EFL/TL ≦ 1.800; and

(3) EFL/ALT is 2.000 ≦ EFL/ALT, preferably 2.000 ≦ EFL/ALT ≦ 3.900.

4. The optical imaging lens further satisfies the following conditional expressions, which is helpful to maintain the thickness and the interval of each lens at an appropriate value, and avoid over-large parameters from being detrimental to the overall thinning of the optical imaging lens, or avoid over-small parameters from affecting the assembly or increasing the difficulty in manufacturing:

(1) l12t61/AAG ≦ 1.600, preferably in the range of 1.000 ≦ L12t61/AAG ≦ 1.600;

(2) L12T41/(T1+ T6) is less than or equal to 3.000, preferably 0.600 is less than or equal to L12T41/(T1+ T6) is less than or equal to 3.000;

(3) L41T62/T1 ≦ 3.600, preferably 0.800 ≦ L41T62/T1 ≦ 3.600;

(4) l11t42/(G23+ G34) ≦ 2.000, preferably 1.100 ≦ L11t42/(G23+ G34) ≦ 2.000;

(5) l21t52/(G23+ G45) ≦ 2.400, preferably 1.200 ≦ L21t52/(G23+ G45) ≦ 2.400;

(6) l12t61/(G23+ G56) ≦ 2.700, preferably 1.800 ≦ L12t61/(G23+ G56) ≦ 2.700;

(7) (ALT24+ G12+ BFL)/Gmax ≦ 2.200, preferably in the range of 0.600 ≦ ALT24+ G12+ BFL)/Gmax ≦ 2.200;

(8) (ALT35+ G12+ BFL)/Gmax ≦ 2.600, preferably in the range of 0.600 ≦ ALT35+ G12+ BFL)/Gmax ≦ 2.600;

(9) (ALT46+ G12+ BFL)/Gmax ≦ 2.300, preferably in the range of 0.700 ≦ ALT46+ G12+ BFL)/Gmax ≦ 2.300; and

(10) (G12+ G34+ BFL)/T1 ≦ 5.300, preferably in the range of 0.700 ≦ (G12+ G34+ BFL)/T1 ≦ 5.300.

5. The optical imaging lens further satisfies the following conditional expressions, which is helpful to maintain an appropriate value for the aperture value and each optical parameter, and avoid that any parameter is too large to reduce the aperture value, or that any parameter is too small to influence the assembly or increase the difficulty in manufacturing:

2 × ImgH × Fno/EFL ≦ 2.000, preferably in the range of 1.300 ≦ 2 × ImgH × Fno/EFL ≦ 2.000.

The three representative wavelengths 470 nm, 555 nm and 650 nm of the embodiments of the present invention are all concentrated near the imaging point, and the deviation of each curve can control the deviation of the imaging point of the off-axis light with different heights, so as to have good spherical aberration, aberration and distortion suppression capability. Further referring to the imaging quality data, the distances between the three representative wavelengths 470 nm, 555 nm and 650 nm are also very close, which shows that the embodiments of the present invention have good concentration to the light with different wavelengths and excellent dispersion suppression capability in various states, and thus it can be seen that the embodiments of the present invention have good optical performance.

The combination ratio relationship of the optical parameters disclosed in the embodiments of the present invention can be implemented in a range of values within the maximum and minimum values.

In addition, any combination relationship of the parameters of the embodiment can be selected to increase the lens limitation, so as to facilitate the lens design with the same structure.

In view of the unpredictability of the optical system design, the configuration of the present invention preferably satisfies the above-mentioned conditions to shorten the system length, increase the aperture, improve the imaging quality, or improve the assembly yield, thereby improving the drawbacks of the prior art.

The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.

Claims

1. An optical imaging lens sequentially including a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element along an optical axis from an object side to an image side, each lens element having an object side surface facing the object side and allowing imaging light to pass therethrough and an image side surface facing the image side and allowing imaging light to pass therethrough, the optical imaging lens includes:

a circumferential area of the image-side surface of the fourth lens element is convex;

a circumferential area of the image-side surface of the sixth lens element is convex;

wherein the optical imaging lens consists of the above six lenses;

the sum of five air gaps of the first lens to the sixth lens on the optical axis is larger than the sum of six thicknesses of the first lens to the sixth lens on the optical axis;

a maximum air gap between the second lens and the third lens;

the object side surface and the image side surface of one of the second lens element to the fifth lens element are aspheric;

and satisfies the following conditional expressions: 2.000 ≦ EFL/ImgH, where EFL is defined as the effective focal length of the optical imaging lens and ImgH is defined as the image height of the optical imaging lens.

2. The optical imaging lens of claim 1, wherein TTL is defined as a distance on the optical axis from the object-side surface of the first lens element to an imaging surface, and the optical imaging lens satisfies the following condition: 0.800 ≦ EFL/TTL.

3. The optical imaging lens system of claim 1, wherein TL is defined as a distance on the optical axis from the object-side surface of the first lens element to the image-side surface of the sixth lens element, and the optical imaging lens system satisfies the following condition: 1.100 ≦ EFL/TL.

4. The optical imaging lens of claim 1, wherein ALT is defined as a sum of thicknesses of six lenses of the first lens to the sixth lens on the optical axis, and the optical imaging lens satisfies the following condition: EFL/ALT ≦ 2.000.

5. The optical imaging lens of claim 1, wherein L12t61 is defined as the distance on the optical axis from the image-side surface of the first lens element to the object-side surface of the sixth lens element, AAG defines the sum of five air gaps on the optical axis from the first lens element to the sixth lens element, and the optical imaging lens satisfies the following conditions: l12t61/AAG ≦ 1.600.

6. The optical imaging lens of claim 1, wherein L12T41 is defined as the distance on the optical axis from the image-side surface of the first lens to the object-side surface of the fourth lens, T1 is defined as the thickness of the first lens on the optical axis, T6 is defined as the thickness of the sixth lens on the optical axis, and the optical imaging lens satisfies the following conditions: L12T41/(T1+ T6) ≦ 3.000.

7. The optical imaging lens of claim 1, wherein L41T62 is defined as the distance on the optical axis from the object-side surface of the fourth lens element to the image-side surface of the sixth lens element, T1 is defined as the thickness of the first lens element on the optical axis, and the optical imaging lens satisfies the following conditions: L41T62/T1 ≦ 3.600.

8. The optical imaging lens as claimed in claim 1, wherein ν 1 is defined as an abbe coefficient of the first lens, ν 2 is defined as an abbe coefficient of the second lens, ν 3 is defined as an abbe coefficient of the third lens, ν 4 is defined as an abbe coefficient of the fourth lens, ν 5 is defined as an abbe coefficient of the fifth lens, ν 6 is defined as an abbe coefficient of the sixth lens, and the optical imaging lens satisfies the following conditions: 255.000 is formed by v 1+ v 2+ v 3+ v 4+ v 5+ v 6.

9. An optical imaging lens as claimed in claim 1, wherein ν 2 is defined as the abbe coefficient of the second lens, ν 3 is defined as the abbe coefficient of the third lens, ν 4 is defined as the abbe coefficient of the fourth lens, ν 5 is defined as the abbe coefficient of the fifth lens, ν 6 is defined as the abbe coefficient of the sixth lens, and the optical imaging lens satisfies the following conditions: v 2+ v 3+ v 4+ v 5+ v 6 ≦ 200.000.

10. The optical imaging lens as claimed in claim 1, wherein ν 2 is defined as an abbe coefficient of the second lens, ν 3 is defined as an abbe coefficient of the third lens, ν 4 is defined as an abbe coefficient of the fourth lens, ν 5 is defined as an abbe coefficient of the fifth lens, and the optical imaging lens satisfies the following conditions: υ 2+ υ 3+ υ 4+ υ 5 ≦ 170.000.

11. The optical imaging lens of claim 1, wherein L11t42 is defined as a distance on the optical axis from the object-side surface of the first lens to the image-side surface of the fourth lens, G23 is defined as an air gap on the optical axis between the second lens and the third lens, G34 is defined as an air gap on the optical axis between the third lens and the fourth lens, and the optical imaging lens satisfies the following conditions: l11t42/(G23+ G34) ≦ 2.000.

12. The optical imaging lens of claim 1, wherein L21t52 is defined as a distance on the optical axis from the object-side surface of the second lens to the image-side surface of the fifth lens, G23 is defined as an air gap on the optical axis between the second lens and the third lens, G45 is defined as an air gap on the optical axis between the fourth lens and the fifth lens, and the optical imaging lens satisfies the following conditions: l21t52/(G23+ G45) ≦ 2.500.

13. The optical imaging lens of claim 1, wherein L12t61 is defined as the distance on the optical axis from the image-side surface of the first lens to the object-side surface of the sixth lens, G23 is defined as the air gap on the optical axis between the second lens and the third lens, G56 is defined as the air gap on the optical axis between the fifth lens and the sixth lens, and the optical imaging lens satisfies the following conditions: l12t61/(G23+ G56) ≦ 2.700.

14. The optical imaging lens of claim 1, wherein ALT24 is defined as a sum of three thicknesses of the second lens element to the fourth lens element on the optical axis, G12 is defined as an air gap between the first lens element and the second lens element on the optical axis, BFL is defined as a distance between the image side of the sixth lens element and an imaging plane on the optical axis, Gmax is a largest air gap between the first lens element to the sixth lens element on the optical axis, and the optical imaging lens satisfies the following conditions: (ALT24+ G12+ BFL)/Gmax ≦ 2.220.

15. The optical imaging lens of claim 1, wherein ALT35 is defined as a sum of three thicknesses of the third lens element to the fifth lens element on the optical axis, G12 is defined as an air gap between the first lens element and the second lens element on the optical axis, BFL is defined as a distance between the image side of the sixth lens element and an imaging plane on the optical axis, Gmax is a largest air gap between the first lens element to the sixth lens element on the optical axis, and the optical imaging lens satisfies the following conditions: (ALT35+ G12+ BFL)/Gmax ≦ 2.620.

16. The optical imaging lens of claim 1, wherein ALT46 is defined as a sum of three thicknesses of the fourth lens element to the sixth lens element on the optical axis, G12 is defined as an air gap between the first lens element and the second lens element on the optical axis, BFL is defined as a distance between the image side of the sixth lens element and an imaging plane on the optical axis, Gmax is a largest air gap between the first lens element and the sixth lens element on the optical axis, and the optical imaging lens satisfies the following conditions: (ALT46+ G12+ BFL)/Gmax ≦ 2.320.

17. The optical imaging lens of claim 1, wherein T1 is defined as a thickness of the first lens on the optical axis, G12 is defined as an air gap between the first lens and the second lens on the optical axis, G34 is defined as an air gap between the third lens and the fourth lens on the optical axis, BFL is defined as a distance between the image side surface of the sixth lens and an imaging surface on the optical axis, and the optical imaging lens satisfies the following conditions: (G12+ G34+ BFL)/T1 ≦ 5.320.

18. The optical imaging lens of claim 1, wherein Fno is defined as an aperture value of the optical imaging lens, and the optical imaging lens satisfies the following condition: 2 × ImgH × Fno/EFL ≦ 2.020.

19. An optical imaging lens sequentially including a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element along an optical axis from an object side to an image side, each lens element having an object side surface facing the object side and allowing imaging light to pass therethrough and an image side surface facing the image side and allowing imaging light to pass therethrough, the optical imaging lens includes:

the first lens element has positive refractive index;

an optical axis region of the image side surface of the sixth lens element is a convex surface;

wherein the optical imaging lens consists of the above six lenses;

a maximum air gap between the second lens and the fourth lens;

and satisfies the following conditional expressions: 3.200 ≦ EFL/ImgH, where EFL is defined as the effective focal length of the optical imaging lens and ImgH is defined as the image height of the optical imaging lens.

20. The optical imaging lens of claim 19, wherein TTL is defined as a distance on the optical axis from the object-side surface of the first lens element to an imaging surface, and the optical imaging lens satisfies the following condition: 0.800 ≦ EFL/TTL.

21. The optical imaging lens system of claim 19, wherein TL is defined as a distance on the optical axis from the object-side surface of the first lens element to the image-side surface of the sixth lens element, and the optical imaging lens system satisfies the following condition: 1.100 ≦ EFL/TL.

22. The optical imaging lens of claim 19, wherein ALT is defined as a sum of thicknesses of six lenses of the first lens to the sixth lens on the optical axis, and the optical imaging lens satisfies the following condition: EFL/ALT ≦ 2.000.

23. The optical imaging lens of claim 19, wherein L12t61 is defined as the distance on the optical axis from the image-side surface of the first lens element to the object-side surface of the sixth lens element, AAG defines the sum of five air gaps on the optical axis from the first lens element to the sixth lens element, and the optical imaging lens satisfies the following conditions: l12t61/AAG ≦ 1.600.

24. The optical imaging lens of claim 19, wherein L12T41 is defined as the distance on the optical axis from the image-side surface of the first lens element to the object-side surface of the fourth lens element, T1 is defined as the thickness of the first lens element on the optical axis, T6 is defined as the thickness of the sixth lens element on the optical axis, and the optical imaging lens satisfies the following conditions: L12T41/(T1+ T6) ≦ 3.000.

25. The optical imaging lens of claim 19, wherein L41T62 is defined as the distance on the optical axis from the object-side surface of the fourth lens element to the image-side surface of the sixth lens element, T1 is defined as the thickness of the first lens element on the optical axis, and the optical imaging lens satisfies the following conditions: L41T62/T1 ≦ 3.600.

26. The optical imaging lens as claimed in claim 19, wherein ν 1 is defined as an abbe coefficient of the first lens, ν 2 is defined as an abbe coefficient of the second lens, ν 3 is defined as an abbe coefficient of the third lens, ν 4 is defined as an abbe coefficient of the fourth lens, ν 5 is defined as an abbe coefficient of the fifth lens, ν 6 is defined as an abbe coefficient of the sixth lens, and the optical imaging lens satisfies the following conditions: 255.000 is formed by v 1+ v 2+ v 3+ v 4+ v 5+ v 6.

27. The optical imaging lens as claimed in claim 19, wherein ν 2 is defined as an abbe coefficient of the second lens, ν 3 is defined as an abbe coefficient of the third lens, ν 4 is defined as an abbe coefficient of the fourth lens, ν 5 is defined as an abbe coefficient of the fifth lens, ν 6 is defined as an abbe coefficient of the sixth lens, and the optical imaging lens satisfies the following conditions: v 2+ v 3+ v 4+ v 5+ v 6 ≦ 200.000.

28. The optical imaging lens as claimed in claim 19, wherein ν 2 is defined as an abbe coefficient of the second lens, ν 3 is defined as an abbe coefficient of the third lens, ν 4 is defined as an abbe coefficient of the fourth lens, ν 5 is defined as an abbe coefficient of the fifth lens, and the optical imaging lens satisfies the following conditions: υ 2+ υ 3+ υ 4+ υ 5 ≦ 170.000.

29. The optical imaging lens of claim 19, wherein L11t42 is defined as the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the fourth lens, G23 is defined as the air gap between the second lens and the third lens, and G34 is defined as the air gap between the third lens and the fourth lens, and the optical imaging lens satisfies the following conditions: l11t42/(G23+ G34) ≦ 2.000.

30. The optical imaging lens system of claim 19, wherein L21t52 is defined as the distance on the optical axis from the object-side surface of the second lens element to the image-side surface of the fifth lens element, G23 is defined as the air gap on the optical axis between the second lens element and the third lens element, G45 is defined as the air gap on the optical axis between the fourth lens element and the fifth lens element, and the optical imaging lens system satisfies the following conditions: l21t52/(G23+ G45) ≦ 2.500.

31. The optical imaging lens system of claim 19, wherein L12t61 is defined as the distance on the optical axis from the image-side surface of the first lens element to the object-side surface of the sixth lens element, G23 is defined as the air gap on the optical axis between the second lens element and the third lens element, G56 is defined as the air gap on the optical axis between the fifth lens element and the sixth lens element, and the optical imaging lens system satisfies the following conditions: l12t61/(G23+ G56) ≦ 2.700.

32. The optical imaging lens of claim 19, wherein ALT24 is defined as a sum of three thicknesses of the second lens element to the fourth lens element on the optical axis, G12 is defined as an air gap between the first lens element and the second lens element on the optical axis, BFL is defined as a distance between the image side of the sixth lens element and an imaging plane on the optical axis, Gmax is a largest air gap between the first lens element to the sixth lens element on the optical axis, and the optical imaging lens satisfies the following conditions: (ALT24+ G12+ BFL)/Gmax ≦ 2.220.

33. The optical imaging lens of claim 19, wherein ALT35 is defined as a sum of three thicknesses of the third lens element to the fifth lens element on the optical axis, G12 is defined as an air gap between the first lens element and the second lens element on the optical axis, BFL is defined as a distance between the image side of the sixth lens element and an imaging plane on the optical axis, Gmax is a largest air gap between the first lens element to the sixth lens element on the optical axis, and the optical imaging lens satisfies the following conditions: (ALT35+ G12+ BFL)/Gmax ≦ 2.620.

34. The optical imaging lens of claim 19, wherein ALT46 is defined as a sum of three thicknesses of the fourth lens element to the sixth lens element on the optical axis, G12 is defined as an air gap between the first lens element and the second lens element on the optical axis, BFL is defined as a distance between the image side of the sixth lens element and an imaging plane on the optical axis, Gmax is a largest air gap between the first lens element and the sixth lens element on the optical axis, and the optical imaging lens satisfies the following conditions: (ALT46+ G12+ BFL)/Gmax ≦ 2.320.

35. The optical imaging lens of claim 19, wherein T1 is defined as a thickness of the first lens on the optical axis, G12 is defined as an air gap between the first lens and the second lens on the optical axis, G34 is defined as an air gap between the third lens and the fourth lens on the optical axis, BFL is defined as a distance between the image side surface of the sixth lens and an imaging surface on the optical axis, and the optical imaging lens satisfies the following conditions: (G12+ G34+ BFL)/T1 ≦ 5.320.

36. The optical imaging lens of claim 19, wherein Fno is defined as an aperture value of the optical imaging lens, and the optical imaging lens satisfies the following condition: 2 × ImgH × Fno/EFL ≦ 2.020.

37. An optical imaging lens sequentially including a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element along an optical axis from an object side to an image side, each lens element having an object side surface facing the object side and allowing imaging light to pass therethrough and an image side surface facing the image side and allowing imaging light to pass therethrough, the optical imaging lens includes:

the second lens element has negative refractive index;

a circumferential area of the object-side surface of the fourth lens element is concave, and a circumferential area of the image-side surface of the fourth lens element is convex;

wherein the optical imaging lens consists of the above six lenses;

a maximum air gap between the first lens and the fourth lens;

and satisfies the following conditional expressions: 2.900 ≦ EFL/ImgH, where EFL is defined as the effective focal length of the optical imaging lens and ImgH is defined as the image height of the optical imaging lens.

38. The optical imaging lens system of claim 37, wherein TTL is defined as the distance on the optical axis from the object-side surface of the first lens element to an imaging surface, and the optical imaging lens system satisfies the following condition: 0.800 ≦ EFL/TTL.

39. The optical imaging lens system of claim 37, wherein TL is defined as the distance on the optical axis from the object-side surface of the first lens element to the image-side surface of the sixth lens element, and the optical imaging lens system satisfies the following condition: 1.100 ≦ EFL/TL.

40. The optical imaging lens of claim 37, wherein ALT is defined as a sum of thicknesses of six lenses of the first lens to the sixth lens on the optical axis, and the optical imaging lens satisfies the following condition: EFL/ALT ≦ 2.000.

41. The optical imaging lens system of claim 37, wherein L12t61 is defined as the distance on the optical axis from the image-side surface of the first lens element to the object-side surface of the sixth lens element, AAG defines the sum of five air gaps on the optical axis from the first lens element to the sixth lens element, and the optical imaging lens system satisfies the following conditions: l12t61/AAG ≦ 1.600.

42. The optical imaging lens system of claim 37, wherein L12T41 is defined as the distance on the optical axis from the image-side surface of the first lens element to the object-side surface of the fourth lens element, T1 is defined as the thickness of the first lens element on the optical axis, T6 is defined as the thickness of the sixth lens element on the optical axis, and the optical imaging lens system satisfies the following conditions: L12T41/(T1+ T6) ≦ 3.000.

43. The optical imaging lens system of claim 37, wherein L41T62 is defined as the distance on the optical axis from the object-side surface of the fourth lens element to the image-side surface of the sixth lens element, T1 is defined as the thickness of the first lens element on the optical axis, and the optical imaging lens system satisfies the following conditions: L41T62/T1 ≦ 3.600.

44. The optical imaging lens as claimed in claim 37, wherein ν 1 is defined as an abbe coefficient of the first lens, ν 2 is defined as an abbe coefficient of the second lens, ν 3 is defined as an abbe coefficient of the third lens, ν 4 is defined as an abbe coefficient of the fourth lens, ν 5 is defined as an abbe coefficient of the fifth lens, ν 6 is defined as an abbe coefficient of the sixth lens, and the optical imaging lens satisfies the following conditions: 255.000 is formed by v 1+ v 2+ v 3+ v 4+ v 5+ v 6.

45. An optical imaging lens as claimed in claim 37, wherein ν 2 is defined as the abbe coefficient of the second lens, ν 3 is defined as the abbe coefficient of the third lens, ν 4 is defined as the abbe coefficient of the fourth lens, ν 5 is defined as the abbe coefficient of the fifth lens, ν 6 is defined as the abbe coefficient of the sixth lens, and the optical imaging lens satisfies the following conditions: v 2+ v 3+ v 4+ v 5+ v 6 ≦ 200.000.

46. The optical imaging lens as claimed in claim 37, wherein ν 2 is defined as an abbe coefficient of the second lens, ν 3 is defined as an abbe coefficient of the third lens, ν 4 is defined as an abbe coefficient of the fourth lens, ν 5 is defined as an abbe coefficient of the fifth lens, and the optical imaging lens satisfies the following conditions: υ 2+ υ 3+ υ 4+ υ 5 ≦ 170.000.

47. The optical imaging lens system of claim 37, wherein L11t42 is defined as the distance on the optical axis from the object-side surface of the first lens element to the image-side surface of the fourth lens element, G23 is defined as the air gap between the second lens element and the third lens element, G34 is defined as the air gap between the third lens element and the fourth lens element, and the optical imaging lens system satisfies the following conditions: l11t42/(G23+ G34) ≦ 2.000.

48. The optical imaging lens system of claim 37, wherein L21t52 is defined as the distance on the optical axis from the object-side surface of the second lens element to the image-side surface of the fifth lens element, G23 is defined as the air gap on the optical axis between the second lens element and the third lens element, G45 is defined as the air gap on the optical axis between the fourth lens element and the fifth lens element, and the optical imaging lens system satisfies the following conditions: l21t52/(G23+ G45) ≦ 2.500.

49. The optical imaging lens assembly of claim 37, wherein L12t61 is defined as the distance on the optical axis from the image-side surface of the first lens element to the object-side surface of the sixth lens element, G23 is defined as the air gap on the optical axis between the second lens element and the third lens element, G56 is defined as the air gap on the optical axis between the fifth lens element and the sixth lens element, and the optical imaging lens assembly satisfies the following conditions: l12t61/(G23+ G56) ≦ 2.700.

50. The optical imaging lens of claim 37, wherein ALT24 is defined as a sum of three thicknesses of the second lens element to the fourth lens element on the optical axis, G12 is defined as an air gap between the first lens element and the second lens element on the optical axis, BFL is defined as a distance between the image side of the sixth lens element and an imaging plane on the optical axis, Gmax is a largest air gap between the first lens element to the sixth lens element on the optical axis, and the optical imaging lens satisfies the following conditions: (ALT24+ G12+ BFL)/Gmax ≦ 2.220.

51. The optical imaging lens of claim 37, wherein ALT35 is defined as a sum of three thicknesses of the third lens element to the fifth lens element on the optical axis, G12 is defined as an air gap between the first lens element and the second lens element on the optical axis, BFL is defined as a distance between the image side of the sixth lens element and an imaging plane on the optical axis, Gmax is a largest air gap between the first lens element to the sixth lens element on the optical axis, and the optical imaging lens satisfies the following conditions: (ALT35+ G12+ BFL)/Gmax ≦ 2.620.

52. The optical imaging lens of claim 37, wherein ALT46 is defined as a sum of three thicknesses of the fourth lens element to the sixth lens element on the optical axis, G12 is defined as an air gap between the first lens element and the second lens element on the optical axis, BFL is defined as a distance between the image side of the sixth lens element and an imaging plane on the optical axis, Gmax is a largest air gap between the first lens element and the sixth lens element on the optical axis, and the optical imaging lens satisfies the following conditions: (ALT46+ G12+ BFL)/Gmax ≦ 2.320.

53. The optical imaging lens system of claim 37, wherein T1 is defined as a thickness of the first lens element on the optical axis, G12 is defined as an air gap between the first lens element and the second lens element on the optical axis, G34 is defined as an air gap between the third lens element and the fourth lens element on the optical axis, BFL is defined as a distance between the image-side surface of the sixth lens element and an imaging surface on the optical axis, and the optical imaging lens system satisfies the following conditions: (G12+ G34+ BFL)/T1 ≦ 5.320.

54. The optical imaging lens of claim 37, wherein Fno is defined as an aperture value of the optical imaging lens, and the optical imaging lens satisfies the following condition: 2 × ImgH × Fno/EFL ≦ 2.020.